1) The southeast outer gate of the wooden palisade -- it appears impossible to move units on top of the towers on either side of the gate. It's possible on the western gate so I assume this is a bug.

I just realized that the reason for this is that for The Wold castle, the entire wall segment on the other side of the river doesn't have any stairs -- thus for the entire segment, it is impossible to get troops up onto the wall. Will be a big problem for defense when town PvP goes live.